I might not be in the right forum but i finished my 3" body lift today, and my truck is not starting sometimes, it just dies.. what could be wrong ? is this a wiring problem ? or something with the gas ? not too sure. help please !

First thing I would check is all the bolts you removed or loosened during the lift process- Mighta messed up a ground.
Next stop is rechecking everything you stretched or disconnected during the lift....